Speaking of vanguard, it got heavy nerfs on preview with commandos and cros.
Rifle company the same with just vet1 now and flamers changed from AI weapon to almost anti garrison exclusive one, they still will be the way to go, but they aren't really IWINs they used to be.
Problem with vanguard is that it also bypasses the limitations other commanders have with their Glider actually providing 3 doctrinal units instead of 1. So you can say the vanguard commander has 7/8 slots instead of 5.